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#!/usr/bin/env bash
# COPYRIGHT NOTICE STARTS HERE
#
# Copyright 2019 Samsung Electronics Co., Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# COPYRIGHT NOTICE ENDS HERE
# Check all ports exposed outside of kubernetes cluster looking for plain http
# endpoints.
#
# Dependencies:
# nmap
# kubectl + config
#
# Return value: Number of discovered http ports
# Output: List of pods exposing http endpoints
#
#Prerequisities commands list
REQ_APPS=(kubectl nmap awk column sort paste grep wc)
# Check for prerequisites apps
for cmd in "${REQ_APPS[@]}"; do
if ! [ -x "$(command -v "$cmd")" ]; then
echo "Error: command $cmd is not installed"
exit 1
fi
done
if [ "$#" -lt 1 ]; then
echo "Usage: $0 <k8s-namespace>"
exit 1
fi
K8S_NAMESPACE=$1
# Get both values on single call as this may get slow
PORTS_SVCS=`kubectl get svc --namespace=$K8S_NAMESPACE -o go-template='{{range $item := .items}}{{range $port := $item.spec.ports}}{{if .nodePort}}{{.nodePort}}{{"\t"}}{{$item.metadata.name}}{{"\n"}}{{end}}{{end}}{{end}}' | column -t | sort -n`
# Split port number and service name
PORTS=`awk '{print $1}' <<<"$PORTS_SVCS"`
SVCS=`awk '{print $2}' <<<"$PORTS_SVCS"`
# Create a list in nmap-compatible format
PORT_LIST=`tr "\\n" "," <<<"$PORTS" | sed 's/,$//'; echo ''`
# Get IP address of some cluster node (both "external-ip" and "ExternalIP" labels are matched)
K8S_NODE=`kubectl describe nodes \`kubectl get nodes | grep -v NAME | head -n 1 | awk '{print $1}'\` | grep "external-ip\|ExternalIP" | awk '{print $2}'`
# perform scan
SCAN_RESULT=`nmap $K8S_NODE -sV -p $PORT_LIST 2>/dev/null | grep \tcp`
# Concatenate scan result with service name
RESULTS=`paste <(printf %s "$SVCS") <(printf %s "$SCAN_RESULT") | column -t`
# Find all plain http ports
HTTP_PORTS=`grep http <<< "$RESULTS" | grep -v ssl/http`
# Count them
N_HTTP=`wc -l <<<"$HTTP_PORTS"`
if [ "$N_HTTP" -gt 0 ]; then
echo "$HTTP_PORTS"
fi
exit $N_HTTP
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